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EFFECT OF RADIAL DISTANCE ON RADIAL STRESSES IN HYDROFORMING DEEP DRAWING PROCESS


Author(s):

Dr.R.Uday Kumar , Mahatma Gandhi Institute of Technology, Gandipet, Hyderabad.500075; Dr.P.Ravinder Reddy, CBIT , Hyderabad; Dr.A.V.Sitaramaraju, JNTUH,Hyderabad

Keywords:

Radial stress, Hydro forming, Shear stress, Deep drawing process, Viscosity

Abstract:

Hydro forming deep drawing process, the pressurized fluid serves several purposes are supports the sheet metal from the start to the end of the forming process, thus yielding a better formed part, delays the onset of material failure and reduces the wrinkles formation. In this forming process, an additional element such as fluid pressure is to be contributes positively in several ways. In hydroforming deep drawing process, applying the hydraulic pressure on blank periphery in radial direction. It is obtained through the punch movement within the fluid chamber, which is provided in punch and die chambers. These two chambers are connected with the bypass path and it is provided in the die. During the process punch movement within the fluid chamber the pressure is generated in fluid and it is directed through the bypass path to blank periphery, the fluid film is created on the upper and lower surfaces of the blank and subsequently reduces frictional resistance and is to reduce tensile stresses acting on the wall of the semi drawn blank. The blank is taking at centre place in between blank holder and die surface with supporting of high pressurized viscous fluid. The radial stresses are produced in the blank in radial direction due to punch force applied on it, the shear stresses acted by viscous fluid on the both sides of blank, so apply viscosity phenomenon to this analysis. The blank holder pressure is controlled by the radial pressure of fluid and these are equal for uniform deformation of blank to obtained required shape and also elimination of failure of blank in deformation. The radial stresses are determined in terms of radial distance, viscosity, blank geometry, process parameters and to study the effect of radial distance on these radial stresses.


Other Details:

Manuscript Id :IJSTEV2I5041
Published in :Volume : 2, Issue : 5
Publication Date: 01/12/2015
Page(s): 63-69
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